1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 #ifndef _LINUX_WAIT_H_ 32 #define _LINUX_WAIT_H_ 33 34 #include <linux/spinlock.h> 35 #include <linux/sched.h> 36 #include <linux/list.h> 37 #include <linux/jiffies.h> 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/sleepqueue.h> 42 #include <sys/kernel.h> 43 #include <sys/proc.h> 44 45 typedef struct { 46 } wait_queue_t; 47 48 typedef struct { 49 unsigned int wchan; 50 } wait_queue_head_t; 51 52 #define init_waitqueue_head(x) \ 53 do { } while (0) 54 55 static inline void 56 __wake_up(wait_queue_head_t *q, int all) 57 { 58 int wakeup_swapper; 59 void *c; 60 61 c = &q->wchan; 62 sleepq_lock(c); 63 if (all) 64 wakeup_swapper = sleepq_broadcast(c, SLEEPQ_SLEEP, 0, 0); 65 else 66 wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0); 67 sleepq_release(c); 68 if (wakeup_swapper) 69 kick_proc0(); 70 } 71 72 #define wake_up(q) __wake_up(q, 0) 73 #define wake_up_nr(q, nr) __wake_up(q, 1) 74 #define wake_up_all(q) __wake_up(q, 1) 75 #define wake_up_interruptible(q) __wake_up(q, 0) 76 #define wake_up_interruptible_nr(q, nr) __wake_up(q, 1) 77 #define wake_up_interruptible_all(q, nr) __wake_up(q, 1) 78 79 #define wait_event(q, cond) \ 80 do { \ 81 void *c = &(q).wchan; \ 82 if (!(cond)) { \ 83 for (;;) { \ 84 sleepq_lock(c); \ 85 if (cond) { \ 86 sleepq_release(c); \ 87 break; \ 88 } \ 89 sleepq_add(c, NULL, "completion", SLEEPQ_SLEEP, 0); \ 90 sleepq_wait(c, 0); \ 91 } \ 92 } \ 93 } while (0) 94 95 #define wait_event_interruptible(q, cond) \ 96 ({ \ 97 void *c = &(q).wchan; \ 98 int _error; \ 99 \ 100 _error = 0; \ 101 if (!(cond)) { \ 102 for (; _error == 0;) { \ 103 sleepq_lock(c); \ 104 if (cond) { \ 105 sleepq_release(c); \ 106 break; \ 107 } \ 108 sleepq_add(c, NULL, "completion", \ 109 SLEEPQ_SLEEP | SLEEPQ_INTERRUPTIBLE, 0); \ 110 if (sleepq_wait_sig(c, 0)) \ 111 _error = -ERESTARTSYS; \ 112 } \ 113 } \ 114 -_error; \ 115 }) 116 117 #define wait_event_interruptible_timeout(q, cond, timeout) \ 118 ({ \ 119 void *c = &(q).wchan; \ 120 long end = jiffies + timeout; \ 121 int __ret = 0; \ 122 int __rc = 0; \ 123 \ 124 if (!(cond)) { \ 125 for (; __rc == 0;) { \ 126 sleepq_lock(c); \ 127 if (cond) { \ 128 sleepq_release(c); \ 129 __ret = 1; \ 130 break; \ 131 } \ 132 sleepq_add(c, NULL, "completion", \ 133 SLEEPQ_SLEEP | SLEEPQ_INTERRUPTIBLE, 0); \ 134 sleepq_set_timeout(c, linux_timer_jiffies_until(end));\ 135 __rc = sleepq_timedwait_sig (c, 0); \ 136 if (__rc != 0) { \ 137 /* check for timeout or signal. \ 138 * 0 if the condition evaluated to false\ 139 * after the timeout elapsed, 1 if the \ 140 * condition evaluated to true after the\ 141 * timeout elapsed. \ 142 */ \ 143 if (__rc == EWOULDBLOCK) \ 144 __ret = (cond); \ 145 else \ 146 __ret = -ERESTARTSYS; \ 147 } \ 148 \ 149 } \ 150 } else { \ 151 /* return remaining jiffies (at least 1) if the \ 152 * condition evaluated to true before the timeout \ 153 * elapsed. \ 154 */ \ 155 __ret = (end - jiffies); \ 156 if( __ret < 1 ) \ 157 __ret = 1; \ 158 } \ 159 __ret; \ 160 }) 161 162 163 static inline int 164 waitqueue_active(wait_queue_head_t *q) 165 { 166 return 0; /* XXX: not really implemented */ 167 } 168 169 #define DEFINE_WAIT(name) \ 170 wait_queue_t name = {} 171 172 static inline void 173 prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state) 174 { 175 } 176 177 static inline void 178 finish_wait(wait_queue_head_t *q, wait_queue_t *wait) 179 { 180 } 181 182 #endif /* _LINUX_WAIT_H_ */ 183